Theorem 2.28. Let A be a subset of a topological space X. Then Int(A), Bd(A), and Int(X – A) are disjoint sets whose union is X.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 10E: For each of the following parts, give an example of a mapping from E to E that satisfies the given...
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Theorem 2.28. Let A be a subset of a topological space X. Then Int(A), Bd(A), and
Int(X – A) are disjoint sets whose union is X.
Transcribed Image Text:Theorem 2.28. Let A be a subset of a topological space X. Then Int(A), Bd(A), and Int(X – A) are disjoint sets whose union is X.
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